A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 5910-00-299-7869
NSN 5950-00-209-9832
NSN 5998-00-125-6383
NSN 5895-01-406-5134
NSN 5996-01-617-9967
NSN 6150-01-632-1443
NSN 5930-01-016-3646
NSN 5998-00-278-4481
NSN 5925-00-315-2238
NSN 6110-00-353-0139
NSN 5985-00-901-1248
NSN 5930-00-053-1680